高等学校化学学报

高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (4): 555.

• 研究论文 • 上一篇    下一篇

MnOx/TiO2催化剂的表面状态与氧化活性

郑柏存, 汪仁, 周静红   

  1. 华东化工学院催化研究所, 上海 200237
  • 收稿日期:1992-08-26 修回日期:1992-12-14 出版日期:1993-04-24 发布日期:1993-04-24
  • 通讯作者: 郑柏存

Surface States and Oxidation Activities of MnOx TiO2 Catalysts

ZHENG Bai-Cun, WANG Ren, ZHOU Jing-Hong   

  1. Research Institute of Catalysis, East China University of Chemical Technology, Shanghai, 200237
  • Received:1992-08-26 Revised:1992-12-14 Online:1993-04-24 Published:1993-04-24

PDF (PC)

摘要： 研究了不同负载量的MnO2/TiO2系列催化剂的表面状态及CO氧化活性。结果表明,当MnO2负载量低于5.7wt％时,MnO2呈Mn2O3相;高于5.7wt％时,MnO2则为Mn2O3+MnO2混合相。Mn2O3由分散态到聚集态的分散阀值为0.028gMn2O3/100mm2TiO2。催化剂氧化活性与其表面状态密切相关。当Mn3+、Mn4+共存时,有利于提高氧化活性。

关键词: 氧化锰, 二氧化钛, 分散状态, 价态分布, 氧化活性

Abstract: The surface states and COoxidation activities of MnO2/TiO2 catalysts with various loading amount were studied in this paper.The results show that manganese oxide was Mn2O3 when the loading amount of MnO2/TiO2 was Lower than 5.7 wt%, while the loading amount was more than 5.7 wt%, MnO2 existed in the form of Mn2O3 and MnO2. The threshold of Mn2O3 from the dispersed states to crystalline phase on TiO2 was 0.028 g Mn2O3/100 m2.The activities of catalysts were relative to their surface states,and the co-existence of Mn3+ and Mn4+ were contributive to increase the activities.

Key words: Manganese oxide, Titania, Dispersion state, Valence state distribution, Oxidation activity

TrendMD: